Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef4f4a53db5c3400355ff3fa571bba28dc09074704e6bc2095cfcf38dd04f4c4' 
  AND token = 'YptbvJMFo3OdJ6T7FIfp9XnyH0Y1TeA99DhZJ8XmU8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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