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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c7a8a85cd3526f8cd58fde4a57efebad12149f4dfe59de268bce5fd36a2fd9' 
  AND token = 'fJ9eVD16vYjXlf3YhtEjnuiIIzksLB3fIC2VO6VNx9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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