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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5c4934a6bc93e888859a8746db90f24a012ce3b5531b162d3e798b857860ec0' 
  AND token = 'wcRan8cTUkOMi5VQ4LFMWWnQW81FAwSMkHy2VKV9mwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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