SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54e737185727a53d6464a36b0ba61db394e98ca287f7dd8945e76455405cb3b0' 
  AND token = 'e8f0HZ8XfssQmKjFRKVLYhzU4o6+P48QIBp50CJUpMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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