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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a7fe78f2e85aed374af1081e192c7bf231a7e151ae03d7fde90b091ce40e21' 
  AND token = '8bYU5sZqddNTqxIp86ArUs1Ioe7ySgbkQSs4uOZha64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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