SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '287e8a7f3a670cc8a59c61fd9294b330de12f6851550e2a97a3ffd4219624a56' 
  AND token = 'nHFQYnHqnbgYLGSvtTwzlnO/yPtl5s3SjekX5TbU+tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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