SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad589ee914f1c338607a83054501a21d1635f277157e59db90cb8d42b522c466' 
  AND token = 'eJ9OBNm/Q79AYlq+GcYA8oqnT2BNPnX9DwTwWjAczEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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