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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56cf93f175e8125f68ff357ef049647474d42b76b3d67f9c0f404cfc400c972' 
  AND token = '+38keoQcdRo/teclKxKNYjhE9qUkjdauzgR46PDNQ58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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