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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fdcbee896974dd8ea1b7b9496d90d66e423df1ebb73f8e3d2ae69caf12279ce' 
  AND token = 'T7Vx5ldWo5zPOYNl9Bg+7rWEreaBj+2ai+lEodk6a2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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