Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13bbb00f5a490cb698a46bb8bb0627eec0c214f9e6682ec16c85faab7d2c520' 
  AND token = 'YRXa25tAtRYEPy5CyxPs5JHAAnF6NfmXe27zSpa5dMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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