SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2776acfca8cb781568bda3d5e347fc697a9945e6e9531becf29feec266ff58f2' 
  AND token = 'u0p0zAGeQzQUvlM+4cUReHS/7KXgJHigsI6V3KOq4UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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