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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a69aef4afc8148d8dedf503bb49b004512ad0d63bb3b67a008fd2d966d0b30a1' 
  AND token = '0/JNslkgTT5HP+iOn+9QG6wje8CbqK/XNu6dtzmnY3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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