SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11dff556b9f775d9b85222e104fe9a57624d3f4f9081c798a4199bcd6e2b153c' 
  AND token = 'f+fBK9uxwTqPjUsC89KhU0sCcTRnmNDzsh0XWnhSVu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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