Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91c5d775b6218509d1eff0843044285819a8a6153ca9d91967090442ed2f1cd' 
  AND token = 'xcSJJ4jaFTCqWMtQ9kEtaxWJd2HBRhN2Z8CovOKG6zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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