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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bc2e4cc4080bad04515c27f66e24b873870205ec34a55712e66f05fb69b0570' 
  AND token = '2Gwon9Ztuo1FnRcSQt5ozhF1t87WbYOvn3PZkme7hNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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