Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a5b87a73a2102d2aae0cee26522c5949490be446c60d3cc9ee482aa6e881c42' 
  AND token = 'r+TBe6SV8N7xjd+JJro7WNLpomRV4Uql8F976Bd+ztM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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