SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4026596dd259518691bc15084eb09fb86010f89348d446f9c422a9f597392d81' 
  AND token = 'B8KQCERV0kaz3EwWZKG/j73XisclRYxbzjIv25a3L9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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