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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8675d616a458f5c4eaac2359a708772ac38a60e2f96ebb93569bd29a6146dc' 
  AND token = 'h5UxyldrGw8EFR24P5YqMnSAm26pnos/KuUjPunw370=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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