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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c634d7a906fba25aa5537f889cfa25a506082950ecae9c7e8040c37dec5d87f' 
  AND token = 'w//J8tz1pIhQnwFBqDio48D1XBMfbgm9Wp1HoAQr5iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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