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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd47882e1485a389084e50b96028f6bd82406668386690c2acfa0ae7a425aae38' 
  AND token = '0NUCt0wAlCMQtqj8XsyNWVxdUXELGXeTbxSFwMYZK+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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