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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b99fb806afe15c0474a58a56e338c72296a00189ad0d36f4e77f7e6a9cbf0f11' 
  AND token = 'szm0XkQyJjthde00B0ElYkXDAVwHGyYq7+gT+Ybojeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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