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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d4e31f4ab7de1a0c8c86e6314f6fdba851a0a67f1198b23ba8e938aef8b8c4' 
  AND token = 'nOmw/4EcrMYE/Upl5n1FO0jgjbM3xscn8l77F3u6zH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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