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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd61410252d2976caf1a947a668d1539d79c5f8a1ddb7c37fa55bf1a46b1666d6' 
  AND token = 'KVZkMMgZwc/Px/UxgtKRaFxmTWa3Ck5UTYYAeKAvuiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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