SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c6976e991555788c14dff1ad7e8a02cb17b01662b220b32e5abb91ed0f45d60' 
  AND token = '+JKwxP73urUzJQzNu+wXrDCmgEXTbjglPuVAJNRoRaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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