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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a491fa7ab795ba33e0bc8593a4346a575662620cf904e16d4cce441143bcc0d1' 
  AND token = 'kFWiIhB77B16IYh5xBejeOiK50gA7jxlL92slYPCBtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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