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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8045768f17112819dd2d90c5f69575664a64ec7329ab8b5680c4d435186df295' 
  AND token = '9SfT1vpEMQIvxvYVxGtaHP7roJu81NHtq9OroOW37u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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