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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9409b86c5f74fa3a124c8eab9f3faff2eb4f8abd1d6e63ab6bec9bcd1a8d8b05' 
  AND token = 'JDlnJSIG0EjSNU3za3F4KVkGyNifg+j7StnNFh70dwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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