SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fef4ece1442a416d15fb9bb7780b4f8003c031406dfecde2cac225e847d2df9' 
  AND token = 'Zk+gKh2QYXB4nZTOIIgJm+DCZszFZmOlMlVzoja0oZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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