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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d5895f822d2f79f4e0c3deffeae95f8d54815f73ec9bedd852687583895e668' 
  AND token = 'yoR1RmQY4QkaPfUHwp4Hxq0NgLYoMS6WIfVst3yNqVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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