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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f6d18980c32a7fca5a5fc0bab8f7907e0171253a441b6005b7a8e0673b8655b' 
  AND token = 'pdQjdGp9kXulvfpGHHQak+hJt5Ms+KilpniVv7nCSSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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