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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '716cef43649cd3c39f1a9dd1dc98a3ec83e587d9726c0ccf9f2f2dee1e98a5aa' 
  AND token = 'vCmCJYgbV2awXSKJ6ZKtL9JYm5YyIFkNkgwDBxzvnck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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