SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59bb3fa94e3624636044886d9b1dfd9557ffd10f94cf17f512e099bbbe15b979' 
  AND token = 'UucZws2+0uC4yu2GL9lOhTs+IJsLwOs2iC+azuHJajY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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