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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '334ae32293e2e0603331392aa36454c1a92de1645c0255a943dadb3a7e55dbed' 
  AND token = '/1W0+dk7CHo7Y472iRIwV8FXlWAqSoXDhnKWKvN6+xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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