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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a948168ff9e0ef330d0c08a0780dfdd056a35b21f10cbabd7b17a34732156ddd' 
  AND token = 'ioLGBAwE4KOCG+mkcALl/Jzb+bU3nKi6B1tzKKxQy6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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