SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd81bc573afc6ea6e39d7a93412468efc28d6699b7dc7edbb8fe6e57342d94b4' 
  AND token = 'hWCFkMNEkPl+nbpwjjbUuQNeYJHlvBfGrnV3SgKto/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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