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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24b8023d9fd559f5088afc13658bef7c93317f1e602cafda03d40d214fb446d5' 
  AND token = 'XOAEzBk03UZ88S61A5xmUIWHfntlfyR+r90J3snu59g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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