SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be857ea10706c788f11a207d3fa0b70c25c332b453f7a63467c9e04f92764b8' 
  AND token = 'lYxhKRlcSz46MdFK9fIIkfPRcrO0wGqvAgwj+HIOpLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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