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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7db60fdf6c589ec09893cc1581d00bd33e36a1eea52e960eb8da7d59f328034d' 
  AND token = 'gmZUQdXFRMej24gtOH0rIpV8922e1PEIjxZEkZZIOow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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