Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd0824a2ea3c4a5ee6e45c83e854e5b6db987c34cbea8e3b76ce0fe7b41fa6f3' 
  AND token = 'arSf9dD27u/zAKae9vS9jsbcx4DRMiHutk51lBoAOco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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