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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d4f4842445df423979fb105e3a5f0267f4a2698a35da58605ddcfcae0d92ed' 
  AND token = 'NC5eod0EzvcH9xWstDbgYt4l0jo6qd2O6bYYmXi/oWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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