SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65cf8bdbf9a0a657891e2ec76943852a9f0bd5fb438faf0e88bcfd77720be79b' 
  AND token = 'U3k7TS+lctpuNqSfnu8C6nmV3jVJGJsHwsv1wvpugoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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