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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd7c672861dbc7b3a555ead0f07ebe8d71c466fa5bf6b1f342a3373dda6e786' 
  AND token = 'oGnZvMqvUO8gDlRoNxYIM+qPk7TjEETgHYrcfbLrW8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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