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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '767f120a43f0c105bdfbaac08a6c0a6112fbe678de8119ef8e02c8682524d960' 
  AND token = '+6I70f1slqLKAog7gCWIttl9B/wZn+vT1AMa+3tfQxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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