SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa57d0b1e941ef14b41f6f00372567c63b41ea37f677f1a4d029b2883cb12a87' 
  AND token = 'yQsQzPDsZBU9UfJZBAowxqnfQ/pYVvzjrHJK9JPAu10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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