SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c164b46a1219acf4dc7713c20cb9871a77b15132af8cd330f1e4ec3371642b15' 
  AND token = 'jrVjRvV7Wza4qr/yCA3l+rkLr/BFH8TYHgvFzsJXdH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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