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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f4ba8c3097e867402f4a5c77f326f7ee196a5388fecb3bac3071b29eecc8451' 
  AND token = 'jRqOazk8eNi7q9De2T/ZOZbbCc4gik01kdhNniZHVlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}