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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc608db76da8f8a07d70dd454408f7f3db65fc0c756aa631c1b44e6ef036cc5' 
  AND token = 'ZJM58buYy7U1lFj/zwlY3sVIfN8Ib7mXWQanlmK4OvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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