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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '398ffc91aa0cedba5b705212527e30d032cfa5ae3e1b1068f67881dd5150889b' 
  AND token = 'gREj6VTQq9WB94pOtuyYFmNozjY1apc3rYeLPicALz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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