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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c16e0821d5fad5b5061efb1e24eda18af8c63792545c5ee26fb717afc454d34a' 
  AND token = 'XkrptK9+YyE7ePW32hCugY66ijNzL3uoyyxhoaNtpws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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