SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd06706573a83e342b399ba6b4a181c7ec218ae911d45b79830d23148565635fd' 
  AND token = 'GwcVmvy4JnE/LTCx9LHWTPQaVgoJ9IlQtBSP8sds5SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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