SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b20648aa3d1d02b6908db3fb3ec646b0c7a347775048422897607f1c985abebb' 
  AND token = 'KjbZ+95hJgOj1eRG/YoWYp0eQBCgzUuR0wER1lRsfek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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