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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80d80b36e5c37f8c9304931e2c2d84ec10e5a6ca0ab93bcd29480724bfc60467' 
  AND token = '1lzOgnfbOAfWV4a1d5mdCBViKxd7Z1AFd0HrKTzUOWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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