SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13e4c0074c92b11b8abb397e51db74c85d9450c673c35abf8c8582945005fad6' 
  AND token = 'AjOqJ6YENK6wvoajOp62eTU4Fqv5/6xRLwjGpLrqSGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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