SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8165cfd1ac0c3c54c64c7cb3db6f3fb8493a101d07accb6c8d35992d4558eb57' 
  AND token = 'zIYE3jWnUq5jV7+wsorXuARGZSJWD5RxB/uhH1hjI/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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