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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7962468aae4e431c9ca5d08d8c014872eb9b483550a718675d241f7edc9f2dba' 
  AND token = 'KVmmndGyc1rQKTw6ZwTwtnH6sxTH6mtw0ZQUtvrtD/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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