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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f811459efa61c9329b71d7af19b59c321f326f6de67fb77fa31cf7a51e47bb9b' 
  AND token = 'wdW3KXVkUEZUc0+x7eEwzggKgsK0S3xHmqFzI+1gaFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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