SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af85426cf045127f5a8b85c23e3016f8db272d9ce631547f2f257d19fb5d2ee3' 
  AND token = '+XUsCkTdIsTLJLfHRWVONPtUu/unh+qK4wbxe9J+7xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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