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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1fcd9b16d37682cce7b3f6452bd27ca57ae7592ab14ab99f6d6ac734eb2e5ab' 
  AND token = 'lRG6k9Emzh3CIfRVTkvxcQIYvEFm7IUTCblh4gy4k7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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