Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81e682a8bc45025bece37989dec3ff4dcef1e28e1a4eb94680d96bae97f3888b' 
  AND token = 'BQ4lZ/XE7hrfSn45OaxO2+QiTzWNSeG9jE5rZ7Rtfm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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