SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '560eef00cc129d239c8b9ca8b8cc918bd4a543bc49221f9d2c7d741c470c569f' 
  AND token = 'OwyxvlB5GlHZvZqMnEAMZg3SfpuwPK1zyjLSyyIiEZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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