SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc496e5777001ea6f6daa80ab52ef55756fb798994de45db4029b5e9f1597623' 
  AND token = 'ZMBYsufX9FjdN9CqNNpRwKMBhZxLiRb6XA1vTl+zDVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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