SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18b4a95920cb54704d7804f9664b8edb99dca5f740b37259b5b8836fea1cd013' 
  AND token = 'VdvGkwGVdEwaI61XR70bY+Bz6oTjp2qWfXG0BcFuQQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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