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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b1d9284f65b4588886af48776e5b1520516154de78aca6ae42252183e58f1bb' 
  AND token = 'Zgt8R1IRSjci64XF4lC8S9WBbXvJ+wXwv0iRFZoGo8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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