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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '749f47f6d39bda55e8f3e7154f50a25753afe38a75ecad9584f6b58ebb60b800' 
  AND token = 'Y6PXMcs9njRYteUfGXaodD5Y2ba6q/Lanw7iqHmz7pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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