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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ac7109edc7ddb8e0866c64cbef58819628d65b914aef75e810cf7264a4a421' 
  AND token = '8hghOTHq8rqUDl45RBNF9TvEG75+lna5XrwdMavKGj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00534

JSON explain

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