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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a8ec94bf130102caa8dece8a037e7b330ad909c1be4953a4b10b5f51538411' 
  AND token = 'VZzA0a6VIALn4JThOlx+VpbLsGB2BgJ/9MzH1pTHZK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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