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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee84b5d5e76d6dfa8bf720858ea247ac08d7d86d14554d84bd834d3b3be50c0' 
  AND token = 'anOwIgS7yMcv0XUd2vSG2z2KVw61FbKbBT2ZvfoH15E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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