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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d89ad6fc8bb5a88d2ac62eb79ab0def6a9d2962d3e313e3f927a85d17a6cad7' 
  AND token = 'v1jy5fO8ddd1C/Df4ftwYsioYDUAn7l0kgMgMqC0O5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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