SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd125580a44ae672f36136238eeba9583e9a26695488342497e3bf2fbaaee593c' 
  AND token = 'hLPydWwqQhzaWgPcIP9VAQo/YLLMzLD9Kvu7j+rNLV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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