SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26f568f06f49dd9204ceb05a23d0857c1b649ca1b31a450ff4e82a99d8383c25' 
  AND token = 'hYPQ7zJCUgG92ds2J6jT4GsNGMVw6+86Mv1Krr47M4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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