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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f4dd31dfb0ee6d4c6f634db84bf7e8bfb0bca70a60b61dd48be3ad2d3864bf' 
  AND token = 'XtJEJKRJRWoLN/OCY3ky28ZJFKUvVAPtML5adqf+w7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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