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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05c68e31d0ce449a4f18a25193ee194fb30209b995e486f8e643b502a5f3b693' 
  AND token = '3dCt1VFNBwt8+w/JPs7k9V3sI9L5QMLYTmOpp93/qF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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