SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b8f4ef9174f45695dee65042e6ae1bd5b888cafaccce57bb5a334a96469e252' 
  AND token = 'TOUv2INSXWPlG3uoysxshy/17Vzhj3Wjmi1Kz0qO8u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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