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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b53125d68c456ad8b888a1e607e3bba31b7875255c390954292b56f506a05ee' 
  AND token = 'BUaJoR1gmFU0a47vwtsfVv7TdjwmNmO7XlD4I5/MywU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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