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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d8286e37b1bf71813a8edb24ad89a4a4013c151ddac395139043baba48845d4' 
  AND token = 'jOM1a7vG5f8EgJYV8fwBA/eD3ywvs4dwlBZU+Sn/e6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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