SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '230a7b942c830220c6b2d11a9c5b6bbafae00bd95bcdc835dfa4a9127053050c' 
  AND token = '7v6ZeXPwAXpRl0/E/mPCBHQXCJKFihUvsKHBYQljFc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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