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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15bc40e8c33b72540ff44f2ce993baa7fa55de0e21ccada009d9788cad61e0fa' 
  AND token = 'A2y9g6Btaudv6x4HvzokWu7GPrEKAuYA5JAk8fhr5vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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