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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eece101f22a4ff0b7cc1fc3ce9e29b453ec84de92551d7dd85bea1ea0bec7c54' 
  AND token = 'B31JQYV2J3P9T32E3ZJF+GUW+/2ItZmjBp/WdRoGIWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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