SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd05a63d0cf529049b038e664b33815400fd558b4804ad993a58a780508377574' 
  AND token = 'B4CYgIwfugRSuJUMGYOcp4Bt3X1zxemAKzP3u+QP7gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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