SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0070357faefb7f33f8d140ca43130e9082ddf69e67a21a973a6c4d547066d5c4' 
  AND token = '6qYmzPBEB1+O5ixk6HvgShTPgIZvFV0jjG8xIaX5QeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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