SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f2bca581d74bedc4485b87ff26bd4958da1607e71365ebed5d1780a914f1343' 
  AND token = 'jgHzNMKqqneLeW9+xHmKHEl+pPGqiSWY8Ie7jJ7fSdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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