Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbef4bf6154e13abb9abd437bb4974cfc320c21beae08d34e02a11a619809f74' 
  AND token = 'ToczrcFXJ3ARSekcI8sTunHPBElZ+9pyGBMABrXDzqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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