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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9f140ca1a1cf166d87eab8bfd625958884a9e07d600c6b9705ce0a2dddede8' 
  AND token = '6BXQ11BZTxGmCLQbHsr/2wq9w3xjXaQARgjCT713N9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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