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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199c2265061578e1437484886d07af2136a56c5e78c0104499aea6029e65e908' 
  AND token = 'w5JetZkp+YvN4xk908PqgSn9myQfyTsjVoWH1CJTrQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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