Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '598fb0bfa7b79f5ee46eb0d57da5be43d4a8cc6c1aee26bd57b3b6710552ecdd' 
  AND token = 'd4T6+XZrqAq/D9Fug4r1gmNWMsDEDWXM8N1gSE5PHq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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