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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '116f1e21b9f34e8c7384b35eb98a16546ba2afabdfbb7d0707a5f244516c4764' 
  AND token = '0tzSTEuh6sBFPN07WxQ87JlxMCwBh1z6Ae7jut6G0G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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