SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee201146d67f0dbfdcf86903d769267a98e97af533c4582646c09a45f5d724f' 
  AND token = 'lIJVZzm1Cze0kSG9gUtLCXjZFzZGRkWcZIQBqjfYf1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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