Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ac767ad5d2c309f12f0ab09157cc99a17bf50498407a73d929f996762ea618' 
  AND token = 'T6ACBIiQ0zqt6n+CTQ0dhVGINDkv3rSOfImbCQHs9Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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