SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a077997d6a57a322c7c79f992d550fd1a1083634c85ba335bc4340a5b452e20' 
  AND token = 'KG46hC9OXwB7+CIQZF3qZ29nFKWpkS1XpR6R/Bo54pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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