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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07197610f1e52a93d2e5cea2d98adc761e47c1fe6bc5f0a91db9dbd0c9fd392c' 
  AND token = 'pAGw8eyJlt59H5fVH/XGKhsVii0F/QjFx4x7hrUyoaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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