SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '372d79172fb84f9625f4d9c343ea2a3ad82f657f5bda085698680baedf6b3b17' 
  AND token = 'aIQiUoPbqWA+6Y4k/c6pG1rya9ujjKkygsGLJZaKFyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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