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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93bb4da029f1a64b46b20ebb2eb036b62bd0debf7927e87a32954221f4a02f64' 
  AND token = 'yZRtTlZqS5pQAZFboXAXd03TzNNHuCdsxdHmRee0UfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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