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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30cc28dcad1733e929b4cf76fa3bc21d118d60d1a2b9f4cded9e7f5fd0a084f7' 
  AND token = 'Noe527LcWgLUTlrYOn3OinidKPQXQGw++94TFNDYFB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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