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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3038c6a57b8622196bff4676c7fef6d92dbe5abba3b783feafeb90eb46aa6c7' 
  AND token = 'eJwOen2aC/7ujia0jxJ4omytBNIiCZGGBZi04InWW5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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