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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d95855eec42dffe3a066157fd5c0d9ab87d5f7ecfee79af64f50bd845c52808' 
  AND token = 'QS7PEcHfW89nNtWnd/Gfc8jALWXoFyHlkNp2m4CO3GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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