SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9370bf85daecd8e2fa202337617f4a2f3e65098b6da6617efd0fffbe9e36369c' 
  AND token = '11qra6J7oWzLbVpPs+gL/Q5mwmCnvC1MlGNTJX945oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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