SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13a84e2d455d76059675e65b45e0c9a425bd457e390a13643aaf1d070fd5194b' 
  AND token = '2VPhd/pIfk3IFG4j+TJ688sZsC7UAMAsp77VwyKOMhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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