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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b30c283476b8c8401303de47b0245a15dfbcf1aed161f03f93c9d70c5ff595' 
  AND token = 'bcnR6kFjvSESb3belwGHTHocqIYWF7XroD4JKX+ckAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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