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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd05299ff958313b23548233705b311e3c7d885cca9baa253b01f628fbac44bd0' 
  AND token = 'ApHAP7jzg2Xza907uj4hHFz7IBsuWprfDMJ3Pdx4K5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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