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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a159b6854e7aaf278396efd6b16ebbc7fa6d628bd637cbbdbde43b642e492b61' 
  AND token = '8mBQLdBfI6sPp1MnJgY4ZnGowUuGwpkbsf/lO8fO7ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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