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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba1ca7efdb7582bc9879ff08eaa121d895fbd1c333aa365ed22f53ee8adf568' 
  AND token = 'Wy5wUhy8ibJ+rTIdsj7JQojy7N0eCjMT4KQO+bLcmJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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