SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ed85bcd76f9894fea7f3c3d12deb43f9ab05a10d45c1c1fd1fe138f3a2f6cbb' 
  AND token = 'VJP03pyGMbovPrwXv+X40vHQ5KFQlykGXxBwWVUZIAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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