SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3459d0c09c553ee7b0ae52a6d70133636e9514e072859abc14d520e7e1b56c44' 
  AND token = 'gv3pWATGTqt/OVzHU+yTTuSsY8KgFbiBj6hz58z+lG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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