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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98935a7bb88a69c005d98823c5919f7237ea8747dd0a362e7f93fe04b0def98d' 
  AND token = 'MW9b2ZlaxpSnpEvj5V2FoPVHQrKurABdyiV+7UTet98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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