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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b591e24ed975de76eddc4d57c7e0dddb433d582b677c4cd02ae74cee3d4f031' 
  AND token = '4IIKJ0MqL770MS9KdlRzqTpxf9RKcy8IwAeNoXCUb5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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