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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3272cc86d167ca99b56b1fbacf1933b73f12d12ae8362c9a6ce5d17445289429' 
  AND token = 'FhwO3gRYpkSBj8gO0ejBoaL7UycWfIXDo7e9eVjMVmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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