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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c5010086a1f077120f8e0a492959c624bbaeae7670ef358c502bd5e9a49d348' 
  AND token = 'LVEWly93DWzk5qaPb70seAvlWbFQ4OUyKWkbaFAkdbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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